DS3 was breech very briefly at the end of my pregnancy - from 36 to 37 weeks. I don't know exactly how long he was in the breech position for. My medical team were aware of this as I had to have scans and was going to have ECV but he turned.
I thought that all babies who were breech after 36 weeks would get a scan on their hips after birth but I don't think he ever got one. I didn't think anything of it. But now he's 8 months old he's struggling to crawl and seems to have issues holding his legs in the correct position, it's like the back half of his body just flops down. I know it's early for crawling and I'm not worried about that anyway. It was just that in particular that I noticed as being different from when my other children learned to crawl. I also notice that he can get his legs right up to his head, exactly like a breech baby position. I can't remember if that's normal at this age.
His next check up will be when he is 10m old so I'll probably mention it then, I just wondered whether anyone else had a similar experience.